Site Navigation Baja California California Colorado Idaho Hawaii Nevada New Mexico Oregon Utah Washington Wyoming     California 20 West - Colusa County Highway Guide Eastbound: Mendocino County Lake County Colusa County Sutter County Yuba County Nevada/Placer Counties Westbound: Nevada/Placer Counties Yuba County Sutter County Colusa County Lake County Mendocino County Business California 20 Williams Grass Valley - Nevada City California 20 west Westbound California 20 in Colusa connects with California 45 north. California 45 follows the west bank of the Sacramento River between Knights Landing (near Woodland) and Hamilton City (near Orland). Photo taken by Dominic Ielati (02/01). The Bear Creek bridge carries California 20 over Bear Creek in western Colusa County after the California 16 intersection. This bridge, built in 1930, still features original white wooden railing. Photo taken 05/29/06. Page Updated December 16, 2007.